User manual VAISALA DRD11A DATASHEET

[. . . ] DRD11A RAIN DETECTOR · Fast and accurate precipitation detection (ON/OFF) · Rain intensity measurement with processing unit · Maintenance free · Heating element for keeping sensor free of snow and condensed moisture, and for quick drying area on the sensor plate, rain intensity has a direct impact on the amplitude and variation of this analog signal. [. . . ] The DRD11A operates via droplet detection rather than by signal level threshold. A special delay circuitry allows about two-minute interval between raindrops before assuming an OFF (no rain) position. This enables the sensor to accurately distinguish between rain cessation and light rain. The DRD11A also features an analog Rain Signal for estimating rain intensity. Since this signal is proportional to the percentage of moist or wet ©Kuvapörssi OY/Digital Vision TECHNICAL DATA SENSOR Capacitive principle, thick layer sensor RainCapTM with a thin glass shield. SENSITIVITY OF RAIN DETECTION Minimum wet area 0. 05 cm² OFF-delay (active) < 5 min PHYSICAL Sensor plate Sensing area 7. 2 cm² Angle 30° Housing material Polypropylene Windshield and support bracket Aluminum Moisture shield Polyurethane Dimensions (h × w × l) With wind shield 110 × 80 × 175 mm Without wind shield 90 × 46 × 157 mm Weight 500 g Cable length 4m ELECTRICAL Supply voltage Supply current Typical less than Maximum Heater OFF Sensor plate Heating power 12 VDC ± 10 % 150 mA 260 mA 25 mA 0. 5 . . . [. . . ] 15 V, 2 mA GROUND WIRING Separate ground wires for signal and heater TEMPERATURE RANGE Operating -15. . . +55 °C (+5. . . +131 °F) Storage -40. . . +65 °C (-40. . . +149 °F) MOUNTING By one screw (M5 x 20 mm) to sensor arm. Vaisala Oyj P. O. Box 26 FIN-00421, Helsinki FINLAND Phone: (+358 9) 894 91 Telefax: (+358 9) 894 9227 B010018en-A [. . . ]